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Joined: 1/22/2010(UTC)
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Our Thermador downdraft didn't want to pop up when you pressed the button. It did this on and off for a few months, then stopped working completely. Mind you, if you pulled up in the middle of the downdraft and lifted it up a few inches, after pushing the button, then the motor would help lift it the rest of the way. Anyway, we replaced the gear motor switch and now it's working properly again. Here's the switch that fixed the problem: BOSCH Switch, micro
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Rank: Member
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Joined: 5/11/2010(UTC)
Posts: 1
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Servicer in post #3 was on the right track (thanks).
If it goes up and down and won't stop or the fan won't go on it is most likely that the piece that goes on the motor shaft has wriggled off the shaft enough so that the raised flange on that piece no longer contacts the switch.
The easiest thing to do is to remove the lower left panel with the unit down and disconnected from electricity. You can reach up to the other side of the motor and try to push what you can feel back toward you onto the motor shaft. Then plug everything back in and try it. If that doesn't work then you may have to proceed with disassembly to get to the switches. But if the starting problem was "goes up and down without stopping and no fan" then this is the likely fix.:)
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Rank: Member
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Joined: 3/1/2012(UTC)
Posts: 3
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On the right side of the motor, there is a little ratchet lever. If you press that in, then the snorkel will go down manually. Don't do what I did and unscrew the gear motor arm to get the snorkel to go down. Just depress the right side of the motor, and the snorkel will go down. You can also manually trip the gear motor switch and the fan switch by reaching to the rear of the J-box. See page 2-5 in the manual. Chances are good that if you are having a problem getting the snorkel up and down, but the motor is working, you have a problem with the gear motor switch. While you have it all apart, just replace the vent switch, too. Also, if you are having problems getting the switch that raises and lowers the snorkel to work, chances are that you have screwed in the side screw too tightly, (that holds the top cap on the snorkel). Loosen it a little an the switch will probably work.
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Rank: Guest
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Joined: 8/10/2018(UTC) Posts: 0  Location: 99556 Was thanked: 4 time(s) in 4 post(s)
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Mine clunks down? Advice?
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Rank: Guest
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Joined: 8/10/2018(UTC) Posts: 0 Location: 99556 Was thanked: 4 time(s) in 4 post(s)
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My CVS downdraft quit raising due to a badly bent linkage plate. The snorkel is down and the motor gear arm is not accessible. How can I get the motor gear arm down? Thanks, Jim
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